Error while testing the extension.

Error while testing the extension.

I have created an extension using integration studio. I have added the reference of this extension in my application. when I try to fetch record using simple query, it is giving the attached error message. Please help me to overcome this issue.

It means you are missing a configuration in Service Center for your extension.
In Service Center go to Factory->Extensions-> Select your extension in the list -> Click on the "Operation" Tab.
There you will have a list of Logical Databases you need to configure.